Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd15a3e5959bbb87…

MALICIOUS

PDF

70.9 KB Created: 2021-02-25 02:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79aa1db05c44a1b3f8c5d87a7b32ecfe SHA-1: b19483fbb59b4e5fc84d352d4235d383d74e8b9d SHA-256: bd15a3e5959bbb871379f6175bfeaf3af201edf1586ccbe47251379153bc3ed0
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and are flagged as part of a link farm. One critical heuristic indicates that PDF links point to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=kinetic+and+potential+energy+calculations+worksheet+answers In PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/nufodikofivi_feketisamezo.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/mezamokuforaxekod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368748/normal_5fc6058e9adc7.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/tolatadaxurari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fdd681017f3d.pdfIn PDF document text
    • https://xisoxobi.weebly.com/uploads/1/3/5/9/135981746/kivapeze_gufanage.pdfIn PDF document text
    • https://kexuminuki.weebly.com/uploads/1/3/4/3/134310960/979dea0b797d.pdfIn PDF document text
    • https://malegudupo.weebly.com/uploads/1/3/0/8/130813961/kerumemogunafoxujado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_6027a1075a21c.pdfIn PDF document text
    • http://lifeeuro.info/rumabwa2zf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_6028f214de22c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotaxebotejij.rf.gd/angular_4_format_date_pipe.pdfIn PDF document text
    • http://tawaxinazaka.rf.gd/novatexanasasabedaw.pdfIn PDF document text
    • http://rakejobik.epizy.com/sowubogopawefo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 5564 bytes
SHA-256: 24a8bbd0a88ab8b072e43d4b24ab98fdfd7b15b2224ea7fe30231b98306a59e7
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 10088 bytes
SHA-256: 83cf66e2b58a463ca93222857b74121a52d7948d0211a8f340b90a35765414c4

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